net.codestory.http.templating.helpers.WebjarHelperSource Maven / Gradle / Ivy

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/**
 * Copyright (C) 2013-2014 [email protected]
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License
 */
package net.codestory.http.templating.helpers;

import java.util.function.Function;

import net.codestory.http.misc.Cache;

import org.webjars.WebJarAssetLocator;

import com.github.jknack.handlebars.Options;

public class WebjarHelperSource {
  private final WebJarAssetLocator webJarAssetLocator;
  private final Function fullPathForUri;

  public WebjarHelperSource(boolean prodMode) {
    this.webJarAssetLocator = new WebJarAssetLocator();
    this.fullPathForUri = prodMode ? new Cache<>(uri -> fullPathForUri(uri)) : uri -> fullPathForUri(uri);
  }

  // Handler entry point

  public CharSequence webjar(Object context, Options options) {
    String attributes = HelperTools.hashAsString(options);

    return HelperTools.toString(context, value -> single_webjar(value, attributes));
  }

  // Internal

  private String single_webjar(Object value, String attributes) {
    String fullPath = fullPathForUri.apply(value.toString());
    return tag(fullPath, attributes);
  }


  private String fullPathForUri(String uri) {
    try {
      return webJarAssetLocator.getFullPath(uri).replace("META-INF/resources/webjars/", "/webjars/");
    } catch (IllegalArgumentException e) {
      return uri;
    }
  }

  private String tag(String fullPath, String attributes) {
    if (fullPath.endsWith(".css")) {
      return "";
    } else {
      return "";
    }
  }
}